Woven screen.



w. s. POTTER.

WOVEN SCREEN.

APPLICATION FILED FEB. 20, 19H.

l 1395,469, hmmm@ May u, 1915,

A TOHIVEYS FFIQE@ WOVEN SCREEN.

Specification of Letters Patent.

Patented May iii, 319I5.

Application led February 20, 1914. 'Serial No. 819,919.

T0 all whom t may concern:

Be it known that I, WINFIELD ScoTT POT- TER, a citizen of the United States, residing at No. 260 Lytton avenue, Pittsburgh, Allegheny county, State of Pennsylvania, have invented certain new and usefulv Improvements in Woven Screens; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the manufacture of screens by the interweaving of longitudinal' and transverse rods 0r bars, it has been customary to give to the interwoven bars a single or a double crimp, as the case may be, the upward crimp.l of the longitudinal bars lying in the hollows of the downward crimps of the transverse bars, and vice versa, and the crimps themselves being of` a gradual or wavy curvature.

vConstructions of this character, have the disadvantage that the surface wear upon the screen is restricted to a limited portion of its area, so that its duration in service is correspondingly lessened.

The purpose of the present invention is to provide a screen of intersecting rods or bars, which shall have a substantially Hat wearing surface, in the sense that the wearing surface of all of the interlocking rodsA or bars shall lie in substantially the same plane, and shall be exposed to practically uniform wear, when in use. The construction likewise insures the establishment and maintenance of mesh apertures of practically unvarying area, comparable to and having the advantage of the corresponding apertures of plate screens, and therefore applicable to many uses for which plate screens are at present regarded as preferable.

In addition to the circumstance that, in the screens made in accordance with the present invention, more metal is available for wear than in the standard crimped screen, and that the wear upon the rods or bars of the screen is alike in both directions, the structure as a whole has the further characteristic feature that the bars are absolutely secured against displacement in any direction or to any degree.

As will hereinafter more fully appear, the meshes of the screen are preferably rectangular, and will usually be square, although the relative length of the sides of the rectangle may vary to accommodate particular requirements of use. So also, the surface view of a screen made in accordancewith the present invention; Fig. 2 represents a llke View and indicates in dotted lines the conditions of wear, in service; Fig. 3 represents a top plan view; Fig. i represents a view similar to Fig. 1, of a modification, wherein the intersecting bars are of rectangular cross-section instead of the cylindrical cross-section shown in the preceding iigures; and Fig. 5 represents a like view to Fig. 4, and indicates in dotted lines the conditions of wear, in service.

Similar letters of reference indicate similar parts throu hout the several views.

Referring to igs. 1, 2 and 3, of the drawing, it will be noted that the screen is made up of interlaced rods having straight portions a with intervening sharp crimps b, of a depth sufficient to accommodate the full diameter of intersecting bars. The sharp crimps b are preferably made in the bars while the bars are hot and the bars are then given an a propriete heat treatments@ as to -relieve t em from strain and bring them again to a practically uniform condition throughout, sov that the only strain which they subsequently receive is that which is necessarily lncident to interweaving them in making up the screen. In this way, a metal too stiff to withstand the combined straining effects of cold crimping and weaving may be made into screens, the metal in the finished product having practically its original condition and characteristics. By the construction described,- all of the bars eX- tending in one direction are embedded in the ioo other set at the crimps or humps b and are n -utilization of the wearing qualities of the metal when used for screen purposes. The humped under-surface of the screen will likewise be apparent from the drawing, and

may itself be used for screening urposes for special uses, and with the a vantage that, in spite of the abruptness of the humps, the bars are nevertheless securely 'locked against displacement, a condition which is not found in the ordinary interwoven bar screen.

In the form of the invention shown in Figs. 4 and 5, the intersecting bars have the straight portions a and the crimps and humps b bear the same relationship to each other as the like bars of the form shown in Figs. 1, 2 and 3, a d the construction is identical'therewitli except that the bars are of square or rectangular cross-section.

For uniformity of construction and use, I prefer to have both of the interwoven sets of bars of the same material and of the same cross-section; but it will be evident that without departing from the spirit of the invention, the one or the other set of bars may be of lesser cross-section, and even of different material, where the difference of wear is slight for the particular .use intended.

What I claimis:

1. A screen made up `of interwoven bars bars embracing and locking against displacement the straight portions of the other set of bars, and the upper surfaces of the straight portions of both sets of bars being in substantially the same plane.

l 2. A screen made up of interwoven bars.I

having straight portions with interveninlgl vsharp crimps forming meshes of a dept substantially equal to the height of the straight portions of the bars, the crimps of the one set of bars embracing and locking against displacement the straight portions of the other set of bars, and the upper surfaces of the straight portions ofboth sets of bars being in substantially the same plane.

3. A screen made up of interwoven bars having straight portions with intervening sharp crimps, the crimps of the one set of bars embracing and locking against displacement the straight portions of the other set of bars, said screen being substantially flat on its upper surface and having rectangular meshes.

4. A screen made up of interwoven bars having straight portions with intervening sharp crimps, the crimps of the one set of bars embracing and locking against displacement the straight portions of the other set of bars, said screen being flat on one surface and having on its other surface av series of abrupt humps of the full cross-section of the bars.

In testimony whereof I affix my signature, in presence of two witnesses.

WINFIELD SCOTT POTTER.

Witnessesz,

C. B. SCHROEDER, M. O. BILL. 

